Quote:
Originally Posted by stangeater01  heres a question for a noob if your throttle body is 90mm which is 3.5" why would you go piping larger than throttle body and why would you go bigger piping then the intercooler inlet and outlet? |
90mm TB is closer to 4" OD. By this I mean that you will need a 4" coupler to get onto a 90mm TB. OP has an LT1 dual 58mm TB so not sure what you need to couple it together.
On my setup, the turbo is 3" OD on the charge side. The intercooler is 3.5" in and out. The TB is a 4" (90mm). I decided to go 3" tubing to the intercooler with a 3" to 3.5" coupler. Then do 3.5" tubing to the TB with a 3.5" to 4" coupler.